A surfactant dispersed N-doped carbon sphere-poly(vinyl alcohol) composite as relative humidity sensor

  • Bruno B. Cunha
  • Márcia W. C. C. Greenshields
  • Messai A. Mamo
  • Neil J. Coville
  • Ivo A. Hümmelgen
Article

Abstract

We report on the use of a composite of N-doped carbon spheres dispersed with hexadecyltrimethylammonium bromide in poly(vinyl alcohol) as an active material for thin film relative humidity (RH) sensors prepared on interdigitated electrodes (IDEs) with gaps of 0.1 or 0.3 mm. The sensors respond to RH variations in the range 9–97 RH % presenting sensitivity (relative variation of conductance per RH variation) up to 1.7 × 103 (IDE with gap of 0.1 mm) and 8.7 × 102 (IDE with gap of 0.3 mm). The response times were 19 and 8 s, and the recovery times were 178 and 142 s, respectively.

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Bruno B. Cunha
    • 1
  • Márcia W. C. C. Greenshields
    • 1
  • Messai A. Mamo
    • 2
  • Neil J. Coville
    • 3
  • Ivo A. Hümmelgen
    • 1
  1. 1.Departamento de FísicaUniversidade Federal do ParanáCuritibaBrazil
  2. 2.Department of Applied ChemistryUniversity of JohannesburgDoornfonteinSouth Africa
  3. 3.DST/NRF Centre of Excellence in Strong Materials, Molecular Sciences Institute, School of ChemistryUniversity of the WitwatersrandJohannesburgSouth Africa

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